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Operating System (101)

Books have been written on these subjects so briefly...  The Operating System (OS) is the heart of a computer, it is the liaison between you, your software (applications) and hardware (keyboard, mouse, cameras, printers, etc.).  Without an OS, you have useless hardware.

There are a variety of Operating Systems, e.g., Windows, Unix, Linux, MAC OS and others.  Within the OS list are many different versions and releases.  Microsoft's Windows versions (not all) include:

Never downgrade a computer's OS

As the industry moves forward with newer hardware and operating system, older hardware becomes obsolete.  The above image and note is one example, another would be printers.  Many older printers may not work on newer computers - Period. 

Example:  We have a good working HP Laserjet 3390 Fax/Copier/Printer with the extra trays, but had to replace it as HP does not offer software/drivers for Windows 7. 
It is for sale if someone can use a fax/copier. ;-)

Manufacturers simply do not (re)write software and/or drivers for old hardware.

The point is, if you install an older operating system, say Windows 7 on a computer that came with Windows 10, you may very well be left with a computer that does not work properly since the hardware (video, sound system, processor, etc.), will have drivers available.

Problems

Again, an entire book (or two) could be dedicated to this so just some basics below.